ISSUER PROFILE · CIK 0001297184
Amphastar Pharmaceuticals IncAMPH
1 13D/G filings
1 distinct filers
2 insider transactions (365d)
Cross-Reference Snapshot
Activist filings
1
1 SCHEDULE 13G
Distinct filers
1
single filer
Insiders (365d)
2
2 buys · 0 sales
Latest short DTC
7.10
as of 2026-09-30
13D/G Filings Timeline · 1 total
Form 4 Insider Transactions · last 365d
| Date | Insider | Role | Type | Shares | Price | Value |
|---|
| 2026-07-09 |
Pierce Anthony T |
director |
Award |
7,886 |
— |
— |
| 2026-07-09 |
Pierce Anthony T |
director |
Award |
16,646 |
$19.02 |
$317K |
FINRA Short Interest History
| Settlement | Short Interest | Days to Cover | % Δ vs prior |
|---|
| 2026-09-30 |
4,405,038 |
7.10 |
-11.8% |
| 2026-09-15 |
4,994,808 |
10.75 |
-2.7% |
| 2026-08-31 |
5,134,473 |
15.36 |
-4.7% |
| 2026-08-14 |
5,385,239 |
9.96 |
+9.3% |
| 2026-07-31 |
4,928,331 |
11.89 |
+18.1% |
| 2026-07-15 |
4,174,460 |
11.15 |
+8.6% |
| 2026-06-30 |
3,845,576 |
5.24 |
+1.2% |
| 2026-06-15 |
3,799,584 |
7.13 |
+1.4% |
| 2026-05-29 |
3,747,543 |
4.73 |
-0.9% |
| 2026-05-15 |
3,779,877 |
4.71 |
+5.4% |
| 2026-04-30 |
3,585,957 |
8.71 |
-8.1% |
| 2026-04-15 |
3,903,290 |
8.63 |
+10.7% |
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